I was going through DI resin like crazy, until I got the Flush kit from BRS. It lasts forever now! Totally worth it. Also make sure the first minute or so you don't send the water through the DI stage until it has a chance to drop the TDS to below 10 or so.
I had to pull a large coral out of my tank and broke some large pieces off my Ponope Birdsnest. Large Frag #1 - $20 $15 Large Frag #2 - $20 $15 Small frag - $5 Disregard the frag of Screaming Green Birdsnest unless you want it to... $5 It's spring Break! So touch base and I may be able to meet, otherwise pickup is in Manor. Sent from my iPhone using Tapatalk
OK, so yeah, your water level of the Overflow should be lower than your tank water level, I'd say either valve down your return, or put a larger pipe on the drain.